Global Patent Index - EP 0779114 A3

EP 0779114 A3 19970709 -

Publication

EP 0779114 A3 19970709

Application

EP 96203232 A 19961119

Priority

US 57172195 A 19951213

Abstract (en)

[origin: EP0779114A2] A method for forming ports (12) on a heat exchanger manifold (14), in which risers (24) are back extruded in a single operation from the surrounding material of the manifold (14) such that subsequent machining steps to further define and finish the ports (12) are unnecessary. The method of this invention generally includes forging the manifold (14) between a pair of die halves (18a,18b) so as to back extrude a localized portion (22) of the manifold (14) into a riser cavity in one of the die halves (18a). Afterwards, and while the manifold (14) remains within the die cavity, a punch (20) is forced through the riser cavity and into the extruded portion (22) in a direction toward the manifold (14) so as to further back extrude the extruded portion (22). This step causes the raised portion to flow in a direction opposite to the direction of the punch (20), producing a riser (24) having an internal bore defined by the punch (20) and an outer surface defined by the cavity. An internal chamfer can be simultaneously formed on the internal bore of the riser in order to facilitate assembly of a tube with the riser (24). The precision of the punch operation yields risers (24) that do not require further machining or finishing to correctly size the risers (24) or form the chamfers.

IPC 1-7

B21C 37/29

IPC 8 full level

F28F 9/02 (2006.01); B21C 37/29 (2006.01); B21J 5/06 (2006.01); F28F 9/04 (2006.01)

CPC (source: EP US)

B21C 37/29 (2013.01 - EP US); F28F 9/02 (2013.01 - EP US); F28F 9/0246 (2013.01 - EP US); Y10T 29/49398 (2015.01 - EP US)

Citation (search report)

Designated contracting state (EPC)

DE FR GB IT

DOCDB simple family (publication)

EP 0779114 A2 19970618; EP 0779114 A3 19970709; EP 0779114 B1 20000412; AR 005071 A1 19990407; BR 9605982 A 19990615; CN 1079710 C 20020227; CN 1168303 A 19971224; DE 69607727 D1 20000518; DE 69607727 T2 20001026; JP H09314271 A 19971209; TW 408047 B 20001011; US 5642640 A 19970701

DOCDB simple family (application)

EP 96203232 A 19961119; AR P960105669 A 19961213; BR 9605982 A 19961212; CN 96123226 A 19961213; DE 69607727 T 19961119; JP 33239696 A 19961212; TW 87104363 A 19980324; US 57172195 A 19951213